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10+12z=28+9z
We move all terms to the left:
10+12z-(28+9z)=0
We add all the numbers together, and all the variables
12z-(9z+28)+10=0
We get rid of parentheses
12z-9z-28+10=0
We add all the numbers together, and all the variables
3z-18=0
We move all terms containing z to the left, all other terms to the right
3z=18
z=18/3
z=6
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